creek mountains consist primarily of fault blocks of basalt , which came from an ancient volcano and other vents , on top of older meta ##morphic rocks . the southern end of the range , however , features many gran ##itic out ##cr ##ops . as a whole , the fault ##ed terrain is dominated by rolling hills and ridges cut by es ##car ##pment ##s and canyon ##s . most of the range is public land administered by the federal bureau of land management . there is very little human development in the remote region — cattle grazing and ranch ##ing are the primary human uses — but former mines at the mc ##der ##mit ##t calder ##a produced some of the largest amounts of mercury in
creek mountains consist primarily of fault blocks of basalt, which came from an ancient volcano and other vents, on top of older metamorphic rocks. the southern end of the range, however, features many granitic outcrops. as a whole, the faulted terrain is dominated by rolling hills and ridges cut by escarpments and canyons. most of the range is public land administered by the federal bureau of land management. there is very little human development in the remote region — cattle grazing and ranching are the primary human uses — but former mines at the mcdermitt caldera produced some of the largest amounts of mercury in